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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb83926ec4fed672444bc4ec134bd634de1262e8a148a2d2d5e7bf6a8e3a34c' 
  AND token = 'hacfulNsyCp+UusoU//irraLeJRJPE/0F1PZaaF8YKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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