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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b93423a3f1d4a5290e9a6c5b17e36b57503fa377357e99a93b5eea897549fd0' 
  AND token = 'bMcP5Cb3epdngCL2EtuEk0T8ur/t0kF8nUc7nA8SlaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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