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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49139b9aedc7ccff73581f61fbb1252f95cfccef7200fd442515db6d2efec9e4' 
  AND token = 'F/3MpDocyJdEIOW8IcsfD2kraLuFUurmXWC0c8K2c1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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