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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ba5ca79df75106b8d5a64b7e4c896c43b56091bc6bc5a13f025494758fa194' 
  AND token = 'WGbAhckzYXxKLJyjVkHZ2u8ln11Tb0rEcqC8T2rDtlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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