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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a561535639a37508d91e325429679ca1324048a269d3c6efe4c01285ae8d5c' 
  AND token = 'H1WRAt3pTimKb6oruapjVeugi6iGLsIbN+fj2hmrODU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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