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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75de1c2b40746c51321da3a355f71a1f2a7b1cde440bc9a759e3515e52cb26ad' 
  AND token = 'CoIjVz5Z8TFYK7V7MHLrKEUBAtGW7ejsjDIg6t/WXkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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