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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb74bb7d963904b6626f07a64a5a2a9ba26cfb6b3ee9ffdd61eab1b79638b64f' 
  AND token = 'egmX82HNAuM4VoPFIwDMHk4RRHsqYiGrsw3sBG1WZdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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