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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0b36b1624e7e6f82f29e0be7d2b1a314180b3cfc4ba4b73bceab5ac674631b7' 
  AND token = 'NIV2XdW9P9TXSiJ3VDt5JlEvwBWpfpsWKqIQC07M2ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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