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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72ba994a0b65e3922ef3e1c4b12a6b400dae9e066e7fc96a4b5c10a35a3b03c6' 
  AND token = 'zE+ymvwHCIQnlrO5O3o6Hb14AZdACsdnxOvatM/oXrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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