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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e313159caed327eeae2d2f15d9d60bb6d1aadebceee990d4c07a4a8c809862' 
  AND token = 'ttNxtokhgwqgp2HfYsJQgbuTO7nNw79e84O/90payJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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