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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c9cd6f9160091d01e02655fd724c26a000c1626fa4ae2cd9d996a7d14db176' 
  AND token = 'jMVCpwsc8om+QvvUpGyTKq5HctdB9k0UBJdqUHNkzDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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