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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38f4661a3d746ac3c4ad021a9c87950bb85fbdda3467ffd4aebe533069494e55' 
  AND token = '1hZenA+aXYxIt99x0Wly6ZF11cbxZTe7QvE0ElxEZYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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