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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619acbc91468db775031193f99e0bbcf4e1ef2076c0d2c6be4031ef45700390a' 
  AND token = '8rd/DUPJyR8AlT03VxSxAZId/fuTfz+Ay+pCVWy97FY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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