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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3a76e5a2bcb5a4dc35115464bcf404fcfdb26a325e61a5493597d99ab67780c' 
  AND token = 'p8S1I0lbW4g8rOTkUBljInCmocHP2svcCuL1v8N6ILA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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