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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89edc177b055b036e34802879bc7b731153305d1271a2c68e835d00a30e3def' 
  AND token = 'zHuQJkW1dWONfGRy6bC8riujEuIi4mENHGlTCJpkOJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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