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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcffb7db9cfebfff96c9d492865f85eb6ddcf9bc7ace264e798ce7d5d4ed8f2e' 
  AND token = '8CrfxiXRkP9mAUE6xUfmbDdCMYAR3TIr4KU+kwCR2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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