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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34d8757a811b7c10162b27492b66820d68b00ed458c680593108920ccf3ec0a0' 
  AND token = 'ssPabbofKkF2tM2SmIK7DdtTffQ6JmFE08V2jAmBwdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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