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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdca823387854c03711a8014c1c1f095f63075fa1f5dc0b362fc4da92b338cde' 
  AND token = 'LfTR7cKUuEbZSNaydSe090msPOaIFE1zdWk/ovCridE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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