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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba310f7be5fe111603fb02b92c7a3dc17673938d2aa7db71900bc98ab3b55bc8' 
  AND token = '7eQKvNjJmBeSBl19MjmEDIaqhDAjA23bTGPiwCR1OKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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