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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d95827dbea4863a49e4d243d0aea7e95a561e17bdf709b0c4c03dacc1e2e15' 
  AND token = 'ZWnctYyKdCPm+1IVJvKCD5/I0YgDHCO25g6g1RYhOHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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