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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00614d5144b7e4abd90b8b93010b8522b096cf93d22d3a9c74a952936c0f1448' 
  AND token = 'slsiyrZBvDDNLhttyK+8Ak+9p2mbcvKpW/64rMQEgMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00700

JSON explain

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