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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f063c3cd17a74c15e50bd489a6645899c955aeceb290813b1123e473d654b94' 
  AND token = 'TDKCpWbL7BqSA2fCWhUs2JYd01phc1b7Q8TjoM06oCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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