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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '346814a85850d990e13afd570b9431fae3bcb7b23ad5d4907b9e6a12281695ef' 
  AND token = '2AGiWvC527U5AbmkceWF6sEq4rgX2rnZMhCr3Mf76x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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