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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4aa23e5a93a057631c0929031171f4f4c186cbf5980479a1d34936d5284a61c' 
  AND token = 'wDH4GPFcZ/l7NSZ7qVPfaN7soDXIGkhngUF918nNZio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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