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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2f9517f3909490e0c0eebb55df60457d5985e7a40ece224a3082ac32ace8ae' 
  AND token = 'Q5inGxZqXvWRlDgUmrSNcxtmUkb0pKXT8HPkhbg39Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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