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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c51ee60282c5e29e81042d43c4125f913b6f6edccbb96ba2124d6241393614' 
  AND token = 'h4bsKpVStTCgGxFkBxFt77AQylYsVUezfM4hXUmT2xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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