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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab3cf5e070fb93a28e1907053d107c76b6bf989bb095b39304d73a1faa44571' 
  AND token = 'KRdSq0QL3kex18l3xJX7tvfYffzhAx5i23/1fInCu/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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