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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6391ec023fa6304e991e58d63c5d0ea4ef3b1c9c90a64e6976b28a8f68bbc2a' 
  AND token = 'JZaZ60mVtWHCFi8cU6y/ghMC60Yz9Fsi3faYbuZkN8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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