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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e550b651dbcae630e7988717679cbb89e3ff929a8b7116d93a8e64ad13becc16' 
  AND token = '0mF/kqRdfKZ7rnjbkIWGcgNL6eaOgY2l8oj6Qc8gojc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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