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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6d9be12c707495c1d0bd9744413d8c164bbf40deff4eade96b2550bdd522842' 
  AND token = 'JGxJZ1gnH9ySQCwuCjg6d9JKAeiSBZrY5A1D8spa16I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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