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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a756210ce821592c57314aab1a7f83d750ce4aba6244700e7bf1c74a5415b14e' 
  AND token = 'X8dIl1bNzLz16qs+2OC8DAsThO/EVrzkdxzOJxADioU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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