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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b85d98ad310a8c9ac56ab90918bc5630eba28d7cf35ca0b7a4c9a85bc50d55' 
  AND token = 'dTcBnJ6HcKTTz7QOTibIPbvKb2iNB7tpLyNiHUOxhIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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