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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5e6f4e40510ea35a4f2b59c369ebd43e6a0906848fc3f37a574d45d46f7a39' 
  AND token = '4qRHymlZLxGNCfmgmgEHVUG2XaSCVAv5TYgYd7lFBUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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