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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4c9949b3fbd67a4fcb4a6ff9b4517cf69cd8dde62b1d9e74ec37297b1710d6' 
  AND token = 'PJ4AFsntb1ZEIZcLIeYx2tbr4BVZ9zE0cu7jH1pPIc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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