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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0b6c4efb93d1ab1ad821c0b2d1a3b6682b439301a53d192035505bc9416d48' 
  AND token = 'WCK7oGALu58GZNmgOiyxpzqcCCXVAcZCgXkWV8wo7Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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