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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36f008c9d8a3008647a8d148e25a1f14197f75a757efc63056fd3a01d8a9a566' 
  AND token = 'c43mfdIXLvL4O2FkVJXLysyKKpnvswucuUlHrqEvY8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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