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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f41acb6fe629047e438d0e507e5fc6d6750c5f76d457c7607f099fab90b1933' 
  AND token = 'Jg60tDBzoDCdOAXv5cjmb1MYS14TXSZ83ZDAbCU31Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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