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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24862638b4f41d0cb6685096aefdc7e42884841df0c2c0e34d0eb0038ecd70bd' 
  AND token = 'Er4lHP7kXcLUln+Oo8UegrrQhCbQxhVJy39q1KlkXbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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