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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b8a1c95afcbe8d18b0452f1cdca6f8f3e06a4d04dce8d5df1a234935826880' 
  AND token = 'Sv0ytBqiCTiDUc9ofkDwG6vxaPexrJoPha84CZjFEC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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