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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73029b166bd9042ae52d80618c94059fc0002e3a42029efd2834a9cbc6e65ba' 
  AND token = 'U4w9EDIWsACt3ZIpmBSjMhEN+z1pfnNGH11o4ADo8vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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