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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9988ad33dd76c8bc690d2860c814462efcdc7c814fa8c9d814bb88e56596b7' 
  AND token = 'oejxQjCaONgJ3oD0usG5o7b/xu30VOQCRDR8e21ys1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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