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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a35b05b9a6bc6eaa0ae3393bdb2e0c205e7a4683a1ff8a4d4be6938d898cd3b' 
  AND token = '/7/MtO78k/XzdF6sb81NV17CTshP1CN7Fry8rx2Iq5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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