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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '520fa05be82709b5649ae37f5c31e23f1c16927c4322361e0a5dc7efdb971b01' 
  AND token = 'TWCTmMh845OllZMHQoxHRDh1wiBUhdwxyqKtrqgiVOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}