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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a28f1e7b6dbc0b362aeee9a7fc78dd92d162fea4b6cb56ba4e899b3aa2b53c8b' 
  AND token = 'CxSkJdrtyOeGCg+pbVib4WGwJ2R7lwOX+7ZH7KaDwHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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