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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9112a895efdc93c4d252f477be41d7a0092eea3ae30befba2f1f92cffb0b33f4' 
  AND token = 'i9WQUdbrfx/4TK7s9kE4BOCP4pFcIIKxCpLYj1zApFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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