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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf2063c5bcf5f6cbf16ffc1574155f94adfe8c62219454c944d35210c7dea857' 
  AND token = 'njQMvn07tsyHYBSj6uPA9Xm5fn6M/31SG5A1wehzE6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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