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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db337e7b4a77cccdf04ca25d6b497c4469f3b69ba91facd08db111a6143ddcac' 
  AND token = 'vPf0IzB2U1H4c01OwJ5ipGL85ZGT7wjnu44U0uFJQbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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