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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '581bbc35eca4774efadec44fa875e840fc44e8257e917c3aab6d929ed7b8bd8d' 
  AND token = 'G2nSyMcmtUcQPjP7CXDSYO4CdmG5nuF6axuV5GyjcYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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