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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b00cb2dbeb25aa1614d929e9441384134aa9e2e95ba60df80ca75cf64e1be553' 
  AND token = 'HhJ3kt8f9mzf2Gc2UdNAM5ACPNTiGMgwHi9uzpWadmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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