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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5652f95659d84cc5dc37422ce9618468caf11b7ada485da19345ce6608834813' 
  AND token = '0Zh71bnJ0XVm92mWrREi6jeIwxJEOPX8xJZQ3VLOem4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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