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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96756c79d0142aa39c68bcea489f9368da943efe1101276b6fe48481600fff52' 
  AND token = 'r7ox8MXNRFDzicKHu31NxY+zGJXZoEXGXMzWeYnk5gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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