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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cce0484f33cf3120d9ae7ce817f70d0ebf13e20141a606c81b801304545d61a' 
  AND token = 'CLv82YhaiJ6YzZQeuziOdPJG9VBfPb9FE5vHrr3U1T8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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