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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a865c52d0244443f0db68b0d73c24d723a3c4bbbcffeda4b577d4309015512b8' 
  AND token = 'cM92utnoDFMhLjowoZKqgfcNyPDKJam+sXvtIg25ngQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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