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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77215845c8f55f60d0a80cd77d416169545bec2ca075e8b9ea5602207139e050' 
  AND token = 'MHqoDF/I/peWo6zvnaEzFbXdaJ0exq5cnPmIJhT26Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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